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-   -   is two full range drivers in one baffle a problem? (http://www.diyaudio.com/forums/multi-way/10194-two-full-range-drivers-one-baffle-problem.html)

bbaker6212 22nd January 2003 12:36 AM

is two full range drivers in one baffle a problem?
 
If you mount two small full-range drivers like the Fostex FE103 virtically in a narrow baffle, will it sound worse than just one? Meaning if one sounds good, will two sound the same, just louder? Or can adding the second one screw up the imaging? If so, how can you tell what kind of spacing (like D'Appalito) there should be between the drivers so as to not screw up the imaging?

planet10 22nd January 2003 12:54 AM

Re: is two full range drivers in one baffle a problem?
 
Quote:

Originally posted by bbaker6212
If you mount two small full-range drivers like the Fostex FE103 virtically in a narrow baffle, will it sound worse than just one? Meaning if one sounds good, will two sound the same, just louder? Or can adding the second one screw up the imaging? If so, how can you tell what kind of spacing (like D'Appalito) there should be between the drivers so as to not screw up the imaging?
Hey baffle-man :)

The answer is, in theory, yes. At some frequency related to the distance between the 2 drivers the HF will start to add & cancel. An MTM XOs the 2 mid basses low enuff low enuff to avoid this. With 2 FE103s as close as possible this is in the 4-6k region.

dave

BAM 22nd January 2003 01:06 AM

1.5-way
 
One could slap a low-pass on the bottom wide-range driver, and thus make the speaker a 1.5-way.

bbaker6212 22nd January 2003 01:09 AM

Any way to remove or reduce this problem? Stagger the drivers with their centers not virtically alligned? Place them side-by-side?
Firing at different slightly different angles?

planet10 22nd January 2003 01:20 AM

Quote:

Originally posted by bbaker6212
Any way to remove or reduce this problem? Stagger the drivers with their centers not virtically alligned? Place them side-by-side?
Firing at different slightly different angles?
You can mount them co-axially (quite difficult in 3-space :)) or at an angle of at least 90 degrees (and if you are going that far you might as well do it 180 degrees and take advantage of push-push.

dave

bbaker6212 22nd January 2003 01:45 AM

Does the cancellations happen in close proximity to the drivers or farther out? Would putting something like neoprene rings on the baffle around the drivers help to reduce this bad effect?

planet10 22nd January 2003 03:15 AM

Quote:

Originally posted by bbaker6212
Does the cancellations happen in close proximity to the drivers or farther out? Would putting something like neoprene rings on the baffle around the drivers help to reduce this bad effect?
No

dave

kelticwizard 22nd January 2003 06:49 AM

This thread has info and references you might find instructive:
http://www.diyaudio.com/forums/showt...threadid=10115

jan.didden 22nd January 2003 07:36 AM

2 full range etc
 
Dave,

I always thought that if you have two drivers close together and feed them with the same signal, you can consider them as one driver with a double area. If there is cancellation, why isn't there cancellation with a single driver from signals from different parts of the cone? Or is there, what they call beaming?


Jan Didden

Two Moons 22nd January 2003 07:52 AM

Quote:

I always thought that if you have two drivers close together and feed them with the same signal, you can consider them as one driver with a double area. If there is cancellation, why isn't there cancellation with a single driver from signals from different parts of the cone? Or is there, what they call beaming?
Jan,

You could consider them one driver if you could manage to have both drivers exactly the same distance to your ears. However, this is practically impossible, since at higher frequencies, minute pathlength differences will cause cancellation. Slouching just a bit from the optimum seating position will destroy the tonal integrity at these higher frequencies. This is why one tweeter is almost always used, with the other drivers LowPassed.

Dave Hull


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